文章基本信息

标题：Ammonia-oxidation as an engine to generate nitrous oxide in an intensively managed calcareous Fluvo-aquic soil
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作者：Tao Huang ; Bing Gao ; Xiao-Kang Hu 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：4
期号：1
DOI：10.1038/srep03950
语种：English
出版社：Springer Nature
摘要：We combine field observations, microcosm, stoichiometry, and molecular and stable isotope techniques to quantify N₂O generation processes in an intensively managed low carbon calcareous fluvo-aquic soil. All the evidence points to ammonia oxidation and linked nitrifier denitrification (ND) being the major processes generating N₂O. When NH₄⁺-based fertilizers are applied the soil will produce high N₂O peaks which are inhibited almost completely by adding nitrification inhibitors. During ammonia oxidation with high NH₄⁺ concentrations (>80 mg N kg⁻¹) the soil matrix will actively consume oxygen and accumulate high concentrations of NO₂⁻, leading to suboxic conditions inducing ND. Calculated N₂O isotopomer data show that nitrification and ND accounted for 35–53% and 44–58% of total N₂O emissions, respectively. We propose that slowing down nitrification and avoiding high ammonium concentrations in the soil matrix are important measures to reduce N₂O emissions per unit of NH₄⁺-based N input from this type of intensively managed soil globally.